Imagine your kidneys are nightclub bouncers. You chug water—that’s a huge crowd of liquid VIPs. The bouncer immediately opens the back door and says, “Move along, folks, this place is full!”
Or think of it as a garden hose. If the tap is already open (you’re hydrated), adding more water just makes the flow faster. If the tap is closed (dehydrated), it takes a bit to get the pressure going. Your body is just a very responsive hose!